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Commit cb723e49 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

Btrfs: reserve space for block groups 



This changes our delayed refs calculations to include the space needed
to write back dirty block groups.

Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 28f75a0e

fs/btrfs/extent-tree.c

+9 −3
Original line number Diff line number Diff line
@@ -2657,7 +2657,8 @@ int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, 
	struct btrfs_block_rsv *global_rsv;

	u64 num_heads = trans->transaction->delayed_refs.num_heads_ready;

	u64 csum_bytes = trans->transaction->delayed_refs.pending_csums;

	u64 num_bytes;

	u64 num_dirty_bgs = trans->transaction->num_dirty_bgs;

	u64 num_bytes, num_dirty_bgs_bytes;

	int ret = 0;



	num_bytes = btrfs_calc_trans_metadata_size(root, 1);
@@ -2666,17 +2667,21 @@ int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, 
		num_bytes += (num_heads - 1) * root->nodesize;

	num_bytes <<= 1;

	num_bytes += btrfs_csum_bytes_to_leaves(root, csum_bytes) * root->nodesize;

	num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(root,

							     num_dirty_bgs);

	global_rsv = &root->fs_info->global_block_rsv;



	/*

	 * If we can't allocate any more chunks lets make sure we have _lots_ of

	 * wiggle room since running delayed refs can create more delayed refs.

	 */

	if (global_rsv->space_info->full)

	if (global_rsv->space_info->full) {

		num_dirty_bgs_bytes <<= 1;

		num_bytes <<= 1;

	}



	spin_lock(&global_rsv->lock);

	if (global_rsv->reserved <= num_bytes)

	if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes)

		ret = 1;

	spin_unlock(&global_rsv->lock);

	return ret;
@@ -5408,6 +5413,7 @@ static int update_block_group(struct btrfs_trans_handle *trans, 
		if (list_empty(&cache->dirty_list)) {

			list_add_tail(&cache->dirty_list,

				      &trans->transaction->dirty_bgs);

				trans->transaction->num_dirty_bgs++;

			btrfs_get_block_group(cache);

		}

		spin_unlock(&trans->transaction->dirty_bgs_lock);

fs/btrfs/transaction.c

+1 −0
Original line number Diff line number Diff line
@@ -251,6 +251,7 @@ static noinline int join_transaction(struct btrfs_root *root, unsigned int type) 
	INIT_LIST_HEAD(&cur_trans->switch_commits);

	INIT_LIST_HEAD(&cur_trans->pending_ordered);

	INIT_LIST_HEAD(&cur_trans->dirty_bgs);

	cur_trans->num_dirty_bgs = 0;

	spin_lock_init(&cur_trans->dirty_bgs_lock);

	list_add_tail(&cur_trans->list, &fs_info->trans_list);

	extent_io_tree_init(&cur_trans->dirty_pages,

fs/btrfs/transaction.h

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ struct btrfs_transaction { 
	struct list_head pending_ordered;

	struct list_head switch_commits;

	struct list_head dirty_bgs;

	u64 num_dirty_bgs;

	spinlock_t dirty_bgs_lock;

	struct btrfs_delayed_ref_root delayed_refs;

	int aborted;